ABSTRACT This study evaluates iron recovery from low grade banded hematite quartzite iron ore. The ore was found susceptible to microwaves and hence carbothermal reduction was pursued. The susceptibility of iron phases to microwave exposure and their selective absorption assists in the liberation of iron values. It was observed that ferrite balls were formed when a small fraction of ore-charcoal mixture was microwave irradiated. The adequate presence of bonded silica content leads to an easy formation of the fayalite phase which leads to fall in the iron grade. Microwave carbothermal reduction at the varying charcoal dosage (6–11%) yielded FeG 45–48% at FeR 40–70%. However, at higher charcoal dosage (11%), ferrite ball formation was observed. Taguchi L9 statistical design revealed the formation of ferrite ball at the higher charcoal dosage (9–12%) and higher power (720–900 W) which accounts for 8–10% of total iron values contained.

中文翻译：

---

碳热还原处理条带状赤铁矿石英岩铁矿石的评价

摘要 本研究评估了低品位条带状赤铁矿石英岩铁矿石的铁回收率。发现矿石易受微波影响，因此进行了碳热还原。铁相对微波暴露的敏感性及其选择性吸收有助于释放铁值。据观察，当一小部分矿石-木炭混合物受到微波辐射时，会形成铁氧体球。足够的键合二氧化硅含量导致容易形成铁橄榄石相，从而导致铁品位下降。在不同的木炭剂量 (6–11%) 下，微波碳热还原在 FeR 40–70% 下产生了 45–48% 的 FeG。然而，在较高的木炭用量 (11%) 下，观察到铁氧体球的形成。